JPH0630183B2 - Magneto-optical recording / reproducing method and device - Google Patents
Magneto-optical recording / reproducing method and deviceInfo
- Publication number
- JPH0630183B2 JPH0630183B2 JP60031958A JP3195885A JPH0630183B2 JP H0630183 B2 JPH0630183 B2 JP H0630183B2 JP 60031958 A JP60031958 A JP 60031958A JP 3195885 A JP3195885 A JP 3195885A JP H0630183 B2 JPH0630183 B2 JP H0630183B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- permanent magnet
- recording medium
- winding
- recording
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 21
- 238000004804 winding Methods 0.000 claims description 39
- 239000010409 thin film Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 230000005381 magnetic domain Effects 0.000 description 5
- 230000010287 polarization Effects 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 230000015654 memory Effects 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001035 Soft ferrite Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910000828 alnico Inorganic materials 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 230000005374 Kerr effect Effects 0.000 description 1
- 229910016629 MnBi Inorganic materials 0.000 description 1
- 229910003962 NiZn Inorganic materials 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10552—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10504—Recording
- G11B11/10508—Recording by modulating only the magnetic field at the transducer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10517—Overwriting or erasing
- G11B11/10519—Direct overwriting, i.e. performing erasing and recording using the same transducing means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
- G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
- G11B11/10536—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording using thermic beams, e.g. lasers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10552—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base
- G11B11/10554—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base the transducers being disposed on the same side of the carrier
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はレーザ光によって情報の記録再生消去をおこな
う光磁気記録再生消去方法及び装置に関する。The present invention relates to a magneto-optical recording / reproducing / erasing method and apparatus for recording / reproducing / erasing information by a laser beam.
（従来技術とその問題点） 光記録方式、特に光ディスクメモリ方式は、高密度・大
容量記録が可能であり、かつ非接触・高速アクセスもで
きるという点から大容量ファイルメモリの一つとして近
年注目を集めている。その中でも記録媒体としてMnBi,M
nCuBi,MnTiBi,MnAlGeなどの結晶性磁性薄膜あるいはTb,
Gd,Dy,Hoなどの希土類金属とFe,Co,Niなどの遷移金属と
の組み合わせによって作成される非晶質磁性薄膜を用い
た光磁気ディスクメモリは、記録情報の書き替えが可能
であるという利点を持っていることから、各所で盛んに
研究されている。(Prior art and its problems) The optical recording method, particularly the optical disk memory method, has recently attracted attention as one of large-capacity file memories because it enables high-density and large-capacity recording and also enables non-contact and high-speed access. Are gathering. Among them, MnBi, M as a recording medium
nCuBi, MnTiBi, MnAlGe or other crystalline magnetic thin film or Tb,
The magneto-optical disk memory using an amorphous magnetic thin film made by combining rare earth metals such as Gd, Dy, Ho and transition metals such as Fe, Co, Ni is said to be able to rewrite recorded information. Because of its advantages, it is being actively researched in various places.
従来、公知の光磁気記録再生消去方式においては、情報
の記録・再生・消去に対してそれぞれ次のような動作が
とられる。記録媒体はあらかじめ媒体の保磁力以上の外
部磁界により一方向に着磁される。Conventionally, in the known magneto-optical recording / reproducing / erasing method, the following operations are performed for recording / reproducing / erasing information. The recording medium is previously magnetized in one direction by an external magnetic field having a coercive force greater than that of the medium.
記録には、レーザ光により発生する熱を利用する。レー
ザ光ビームを１〜２μｍφの微小スポットに絞り、記録
媒体に照射し、媒体温度を上昇させる。キューリ温度記
録をおこなう場合には、記録媒体をキューリ温度以上に
上昇させ、外部印加磁界あるいは記録媒体の反磁界によ
って反転磁区を形成する。補償温度記録をおこなう場合
には記録媒体の補償温度を室温付近に設定し、レーザ光
ビーム照射によってある温度まで昇温させ、媒体の保磁
力低下を利用し、外部印加磁界によって反転磁区を形成
する。前記手段により記録２値信号「１」「０」を記録媒体
の反転磁区の有無に対応した形で記録できる。The heat generated by the laser light is used for recording. The laser light beam is focused on a minute spot of 1 to 2 μmφ and irradiated on the recording medium to raise the medium temperature. When Curie temperature recording is performed, the recording medium is heated to a temperature above the Curie temperature and an inverted magnetic domain is formed by an externally applied magnetic field or a demagnetizing field of the recording medium. When performing compensation temperature recording, set the compensation temperature of the recording medium near room temperature, raise it to a certain temperature by laser beam irradiation, and use the reduction of the coercive force of the medium to form an inverted magnetic domain by an externally applied magnetic field. . By the means, the recording binary signals "1" and "0" can be recorded in a form corresponding to the presence or absence of the reversed magnetic domain of the recording medium.
再生は磁気光学効果（Kerr効果あるいはFaraday効果）
を用いておこなわれる。すなわち記録媒体の反転磁区の
有無に対応して媒体からの反射光あるいは透過光の偏光
面が回転することを利用し、記録媒体から情報を読み出
す。記録媒体には記録時にくらべ低パワレベルのレーザ
光が照射され、その反射光または透過光から信号を再生
する。Reproduction is magneto-optical effect (Kerr effect or Faraday effect)
Is performed using. That is, information is read from the recording medium by utilizing the fact that the polarization plane of the reflected light or transmitted light from the medium rotates depending on the presence or absence of the reversed magnetic domain of the recording medium. The recording medium is irradiated with a laser beam having a lower power level than during recording, and a signal is reproduced from the reflected light or the transmitted light.
記録情報を消去する場合には、外部磁界を記録時とは逆
磁性に印加し、レーザ光ビームを記録時と同等の強度で
記録媒体に一様に照射するいわゆる一括消去が行われ
る。外部磁界印加により記録媒体の磁化状態は記録前の
初期状態に戻る。When erasing recorded information, so-called collective erasing is performed in which an external magnetic field is applied in a magnetic field reverse to that used during recording, and a laser light beam is uniformly irradiated onto the recording medium at the same intensity as during recording. By applying an external magnetic field, the magnetization state of the recording medium returns to the initial state before recording.
ここで、公知の外部磁界印加手段は、たとえば空心コイ
ルを用いる方法、電磁石を用いる方法、あるいは永久磁
石を用いる方法である。Here, the known external magnetic field applying means is, for example, a method using an air-core coil, a method using an electromagnet, or a method using a permanent magnet.
しかしながら、記録時と消去時では通常数百エルステッ
ド以上の印加磁界が必要であるために、空心コイルを用
いる場合には、コイルが大型化しこれに伴って、磁界切
替え速度が遅くなると共に記録媒体とコイルとの距離を
十分に接近させないと、所要印加磁界が得られないとい
う欠点がある。また、電磁石を用いる場合にも、磁界印
加手段は大型化し、磁界切替え速度が遅いという欠点を
生じる。さらに、永久磁石を用いる場合は、機械的な駆
動手段を用いて磁界を切替えるため、複雑な機構が必要
であり、この場合も磁界切替速度は遅いものとなる。However, an applied magnetic field of several hundred oersteds or more is usually required at the time of recording and erasing. Therefore, when an air-core coil is used, the size of the coil becomes large and the magnetic field switching speed becomes slower and the recording medium becomes smaller. There is a drawback that the required applied magnetic field cannot be obtained unless the distance from the coil is sufficiently short. Further, even when an electromagnet is used, the magnetic field applying means becomes large in size and the magnetic field switching speed is slow. Further, when a permanent magnet is used, a magnetic field is switched by using a mechanical driving means, so a complicated mechanism is required, and in this case also, the magnetic field switching speed becomes slow.
以上述べた様に、従来のいずれの方法においても、磁界
切替え速度は遅いために、消去には上述した一括消去方
式が用いられ、また記録には、一定磁界印加中にレーザ
パワーを高速変調する方法が用いられていた。すなわ
ち、従来装置では、既に記録された情報に、新しい情報
を高速で重ね書きするいわゆるオーバライト性能を持た
せることは不可能であった。As described above, in any of the conventional methods, since the magnetic field switching speed is slow, the above-described collective erasing method is used for erasing, and for recording, the laser power is modulated at high speed during application of a constant magnetic field. The method was used. That is, in the conventional device, it is impossible to provide so-called overwrite performance for overwriting already recorded information with new information at high speed.
（発明の目的） 本発明の目的は、この様な従来の欠点を除くために成さ
れたものであり、オーバライト性能を有する新規な光磁
気記録再生消去装置及び方法を提供することにある。(Object of the Invention) An object of the present invention is to eliminate such drawbacks of the prior art, and to provide a novel magneto-optical recording / reproducing / erasing apparatus and method having overwrite performance.
（発明の構成） すなわち本願第１の発明は、垂直磁気異方性を有する磁
性薄膜を記録媒体とし、レーザ光及び外部印加磁界によ
って情報の記録・再生・消去を行う光磁気記録再生消去
方法において、永久磁石と、前記永久磁石の一方の磁極
に接触して前記永久磁石に直角に対向するように構成し
た部分と前記永久磁石に直角に対向するように構成した
前記部分に一端を接触し他端を前記永久磁石の他方の磁
極に接近するように前記永久磁石に平行に対向するよう
に構成した部分とを有する高透磁率磁性体からなるコア
部と、前記永久磁石に平行に対向するように構成した前
記部分に巻き線を設け、前記巻き線に電流が流れている
ときに前記記録媒体に磁界を印加し、前記巻き線に電流
が流れていないときに前記記録媒体に磁界を印加しない
ようにした前記磁界印加装置を、前記記録媒体の上下両
側に前記永久磁石の同一磁極を互いに対向するように所
定の間隔を置いて固定して設置し、前記記録媒体に所定
のレーザ光を照射しながら、記録時に、一方の前記磁界
印加装置の巻き線に電流を流し、前記記録媒体に一方向
の磁界を印加し、消去時に、他方の前記磁界印加装置の
巻き線に電流を流し、記録時とは異なる方向の磁界を印
加するようにしたことを特徴とする光磁気記録再生消去
方法である。(Structure of Invention) That is, the first invention of the present application is a magneto-optical recording / reproducing / erasing method in which a magnetic thin film having perpendicular magnetic anisotropy is used as a recording medium to record / reproduce / erase information by a laser beam and an externally applied magnetic field. , One end of the permanent magnet and a portion of the permanent magnet that is in contact with one of the magnetic poles of the permanent magnet to face the permanent magnet at a right angle and the other portion of the permanent magnet that faces the permanent magnet at a right angle of A core portion made of a high-permeability magnetic body having an end configured to face the permanent magnet in parallel so as to approach the other magnetic pole of the permanent magnet, and a core portion configured to face the permanent magnet in parallel. And a magnetic field is applied to the recording medium when current is flowing through the winding, and no magnetic field is applied to the recording medium when no current is flowing through the winding. Yo The magnetic field applying device is installed by fixing the same magnetic poles of the permanent magnets on the upper and lower sides of the recording medium at predetermined intervals so as to face each other, and irradiating the recording medium with a predetermined laser beam. However, at the time of recording, an electric current is applied to the winding of one of the magnetic field applying devices to apply a magnetic field in one direction to the recording medium, and at the time of erasing, an electric current is applied to the winding of the other magnetic field applying device for recording. The method is a magneto-optical recording / reproducing / erasing method characterized in that a magnetic field in a direction different from is applied.
また、本願第２の発明は、光ヘッドと、記録媒体への磁
界印加手段とを備えた光磁気記録再生消去装置におい
て、磁界印加手段は、永久磁石と、前記永久磁石の一方
の磁極に接触して前記永久磁石に直角に対向するように
構成した部分と前記永久磁石に直角に対向するように構
成した前記部分に一端を接触し他端を前記永久磁石の他
方の磁極に接近するように前記永久磁石に平行に対向す
るように構成した部分とを有する高透磁率磁性体からな
るコア部と、前記永久磁石に平行に対向するように構成
した前記部分に巻き線を設け、前記巻き線に電流が流れ
ているときに前記記録媒体に磁界を印加し、前記巻き線
に電流が流れていないときに前記記録媒体に磁界を印加
しないようにしてなり、該磁界印加手段は記録媒体を介
してその上下両側に前記永久磁石の同一磁極を互いに対
向するように設置され、さらに前記両側の巻き線には記
録時と消去時とで交互にどちらかの巻き線に電流を印加
する電流源が接続していることを特徴とする光磁気記録
再生消去装置である。A second invention of the present application is a magneto-optical recording / reproducing / erasing apparatus including an optical head and a magnetic field applying unit for a recording medium, wherein the magnetic field applying unit contacts the permanent magnet and one magnetic pole of the permanent magnet. Then, one end is brought into contact with the portion configured to face the permanent magnet at a right angle and the portion configured to face the permanent magnet at a right angle so that the other end approaches the other magnetic pole of the permanent magnet. A core portion made of a high-permeability magnetic body having a portion configured to face the permanent magnet in parallel and a winding wire provided in the portion configured to face the permanent magnet in parallel, A magnetic field is applied to the recording medium when a current is flowing through the recording medium, and a magnetic field is not applied to the recording medium when no current is flowing through the winding. On both sides The same magnetic poles of the permanent magnet are installed so as to face each other, and a current source for applying a current to either winding during recording and erasing alternately is connected to the windings on both sides. It is a magneto-optical recording / reproducing / erasing apparatus characterized by.
（構成の詳細な説明） 次に、本発明の構成例について図面を用いて詳細に説明
する。第１図は、本発明に係る光磁気記録再生消去装置
の構成例を示したものである。これによるを、垂直磁気
異方性を有する磁性薄膜２を記録媒体とする光磁気ディ
スク１の上方に光磁気記録用ヘッド３、その両側に、外
部磁界印加手段４，５が設けられている。ここで光磁気
記録用ヘッド３は記録再生消去用の光学系及び光検出機
構を具備した、従来と同等のものであるが、外部磁界印
加手段が従来と異なる。(Detailed Description of Configuration) Next, a configuration example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a structural example of a magneto-optical recording / reproducing / erasing apparatus according to the present invention. According to this, a magneto-optical recording head 3 is provided above a magneto-optical disk 1 having a magnetic thin film 2 having perpendicular magnetic anisotropy as a recording medium, and external magnetic field applying means 4 and 5 are provided on both sides thereof. Here, the magneto-optical recording head 3 is the same as the conventional one, which is provided with an optical system for recording / reproducing and erasing and a light detecting mechanism, but the external magnetic field applying means is different from the conventional one.
第２図は、この外部磁界印加手段の構成例を示した図で
あり、板状の永久磁石22と、この永久磁石の記録媒体側
の磁極と対向する部分及び巻線24が施こされた部分とを
有したＬ型の高透磁率磁性体からなるコア部23とから成
る。FIG. 2 is a diagram showing a configuration example of the external magnetic field applying means, in which a plate-shaped permanent magnet 22, a portion of the permanent magnet facing the recording medium side magnetic pole, and a winding 24 are provided. And a core portion 23 made of an L-type high-permeability magnetic body having a portion.
そして、巻線24は電流源20に接続され、巻線24への電流
の有無によって第３図に示す様に記録媒体へ磁場の印加
と遮蔽が選択される。The winding 24 is connected to the current source 20, and the application or shielding of the magnetic field to the recording medium is selected depending on the presence / absence of a current in the winding 24, as shown in FIG.
すなわち、巻線24に電流が流れていない時は、第３図
(a)に示す様に、コア部23は永久磁石22の磁極から生じ
る磁束をもう一方の磁極へ、効率良く導く磁路を形成す
るため、記録媒体側へは磁界が殆ど印加されない。一
方、第３図(b)に示す様に巻線24に電流Ｉが流れる場
合、電流Ｉによってコア部23内に生じる磁束の分だけ、
永久磁石22の磁極から、磁界が外部に漏れるため、記録
媒体へ垂直方向のバイアス磁界が印加される様になる。
第３図(c)は巻線に流れる電流Ｉと、バイアス磁界ＨＢ
との関係を示したものであり、電流Ｉの増加に伴って、
バイアス磁界ＨＢは増加し、コア部23の磁化が飽和に近
づくにつれて、バイアス磁界ＨＢも飽和する傾向を示
し、電流値ＩＳ以上では従来の永久磁石バイアスと同等
のバイアス磁界を得ることができる。That is, when no current is flowing through the winding 24,
As shown in (a), since the core portion 23 forms a magnetic path that efficiently guides the magnetic flux generated from the magnetic pole of the permanent magnet 22 to the other magnetic pole, almost no magnetic field is applied to the recording medium side. On the other hand, when the current I flows through the winding 24 as shown in FIG. 3 (b), only the magnetic flux generated in the core portion 23 by the current I
Since the magnetic field leaks from the magnetic pole of the permanent magnet 22 to the outside, a vertical bias magnetic field is applied to the recording medium.
FIG. 3 (c) shows the current I flowing in the winding and the bias magnetic field H B.
And the relationship with the increase of the current I,
The bias magnetic field H B increases, and as the magnetization of the core portion 23 approaches saturation, the bias magnetic field H B also tends to saturate, and at a current value I S or higher, a bias magnetic field equivalent to that of a conventional permanent magnet bias can be obtained. it can.
第１図においては、この様な外部磁界印加手段４，５
が、記録媒体の両側に、永久磁石の磁極Ｎが互いに対向
する様に配設されている。従って記録媒体の上側に設置
した外部磁界印加手段のコイル通電中は記録媒体に下向
きのバイアス磁界が印加され、一方、反対側に設置した
外部磁界印加手段のコイル通電中は、上向きの磁界が印
加される。この様に、バイアス磁界の方向が２つの外部
磁界印加手段に流す電流の切替によって制御できる。In FIG. 1, such external magnetic field applying means 4, 5
However, the magnetic poles N of the permanent magnets are arranged on both sides of the recording medium so as to face each other. Therefore, a downward bias magnetic field is applied to the recording medium while the external magnetic field applying means installed on the upper side of the recording medium is energized, while an upward magnetic field is applied during coil energization of the external magnetic field applying means installed on the opposite side. To be done. In this way, the direction of the bias magnetic field can be controlled by switching the currents flowing through the two external magnetic field applying means.
ここで、記録媒体に対して、光磁気記録用ヘッド３と同
じ側に設けられる外部磁界印加手段４は光ビームの経路
をさえぎらない様に、記録媒体走向方向に少しずれた位
置に、斜めに配設する必要がある。このとき、永久磁石
22の長手方向と記録媒体面とのなす角度は、記録媒体に
印加される磁場の垂直成分を考慮すると、４５゜以上が
望ましい。Here, the external magnetic field applying means 4 provided on the same side as the magneto-optical recording head 3 with respect to the recording medium is obliquely positioned at a position slightly deviated in the traveling direction of the recording medium so as not to interrupt the path of the light beam. Must be installed. At this time, the permanent magnet
The angle between the longitudinal direction of 22 and the surface of the recording medium is preferably 45 ° or more in consideration of the vertical component of the magnetic field applied to the recording medium.
ここで、永久磁石22としては、厚さ数ミリメートル、幅
及び長さが数ミリ〜数十ミリメートルのサマリウムコバ
ルト磁石やアルニコ磁石もしくはフェライト磁石が用い
られ、コア部23としては、厚さ数ミリメートル、磁路長
及び幅が数ミリ〜数十ミリメートルのNiFe合金、もしく
はNiZnフェライトやMnZnフェライトのソフトフェライト
が用いられ、又巻線24としては、線径数十ミクロン〜数
百ミクロンの銅線が用いられ巻数は、数十ターンであ
る。又、電流値Ｉｓとしては、数十〜数百ミリアンペア
が用いられる。Here, as the permanent magnet 22, a thickness of several millimeters, a samarium cobalt magnet or an alnico magnet or a ferrite magnet having a width and a length of several millimeters to several tens of millimeters is used, and the core portion 23 has a thickness of several millimeters. NiFe alloy with a magnetic path length and width of several millimeters to several tens of millimeters, or soft ferrite such as NiZn ferrite or MnZn ferrite is used, and a copper wire with a wire diameter of several tens of microns to several hundreds of microns is used as the winding 24. The number of turns is tens of turns. Moreover, as the current value Is, several tens to several hundreds of milliamperes are used.
この様にして構成した外部磁界印加手段では、巻線のイ
ンダクタンスＬを１μＨ以下にすることが容易なため、
数百エルステッドオーダの磁場の数メガヘルツオーダで
の高速切替えが記録媒体から数ミリメートル離れた位置
からでも、容易に実現できる。In the external magnetic field applying means thus configured, it is easy to set the inductance L of the winding to 1 μH or less,
High-speed switching of a magnetic field of several hundred Oersted order in several megahertz order can be easily realized even from a position several millimeters away from the recording medium.
光磁気記録用ヘッド３は第１図に示した様に従来と同等
のものであり、次の様な構成を有する。６は直線偏向の
レーザ光源であり、たとえば半導体レーザが使用され
る。７，８，９はビームスプリッタである。レーザ光ビ
ーム集光用レンズ10はアクチュエータ11により支持され
ている。フォーカスエラならびにトラッキングエラー信
号はそれぞれフォーカスエラー検出用受光素子12、トラ
ッキングエラー検出用受光素子13によって検出されサー
ボ制御回路14，15に入力され、サーボ信号となり、前記
アクチュエータ11にフィードバックされる。再生信号は
偏光フィルタ16を通過後、再生信号検出用受光素子17に
よって検出され、再生信号増幅回路18によって増幅され
る。The magneto-optical recording head 3 is the same as the conventional one as shown in FIG. 1 and has the following configuration. Reference numeral 6 is a linearly polarized laser light source, and for example, a semiconductor laser is used. Reference numerals 7, 8 and 9 are beam splitters. The laser light beam focusing lens 10 is supported by an actuator 11. The focus error and the tracking error signal are detected by the focus error detecting light receiving element 12 and the tracking error detecting light receiving element 13, respectively, and are inputted to the servo control circuits 14 and 15 to become servo signals, which are fed back to the actuator 11. After passing through the polarization filter 16, the reproduction signal is detected by the reproduction signal detecting light receiving element 17 and amplified by the reproduction signal amplifying circuit 18.
偏光フィルタ16としてはたとえばグラムトムソンプリズ
ムが用いられる。再生信号検出用受光素子17としては、
たとえばPINフォトダイオードまたはアバランシェ・フ
ォトダイオードが使用される。レーザ光源６の変調には
レーザ光源変調用回路19が使用され、記録時・消去時・
再生時に合わせてレーザ光源のパワーが変調される。As the polarization filter 16, for example, a Gram Thomson prism is used. As the light receiving element 17 for reproducing signal detection,
For example, PIN photodiodes or avalanche photodiodes are used. A laser light source modulation circuit 19 is used to modulate the laser light source 6, and is used for recording / erasing
The power of the laser light source is modulated at the time of reproduction.
次に、本発明に係る記録再生消去方法を説明する。Next, a recording / reproducing / erasing method according to the present invention will be described.
第４図(a)〜(d)に記録の動作モード図を示す。記録媒体
をキューリ温度以上に上昇できる一定強度のレーザビー
ムを照射しながら（第４図(a)、外部磁界印加手段４及
び５の巻線にそれぞれ、ＩＡ及びＩＢの変調電流を交互
に流すことによって（第４図(b)，(c)）、記録パターン
に対応した外部磁界が印加され記録媒体の走向に伴う冷
却過程で、印加磁界方向に対応して、(d)に示す様な記
録磁化状態が実現される。従来の記録が、一方向に着磁
された磁性薄膜に反転磁区を形成して記録をおこなうの
に対して本発明に係る記録では、記録磁化状態が２つの
外部磁界印加手段の巻線に流す電流の切替方向に対応し
た形で決定される。4A to 4D show operation mode diagrams of recording. While irradiating a laser beam having a constant intensity capable of raising the recording medium to a temperature above the Curie temperature (FIG. 4 (a), the modulation currents I A and I B are alternately applied to the windings of the external magnetic field applying means 4 and 5, respectively. By flowing (Figs. 4 (b) and (c)), an external magnetic field corresponding to the recording pattern is applied, and in the cooling process accompanying the strike of the recording medium, as shown in (d), corresponding to the direction of the applied magnetic field. In contrast to the conventional recording in which the reversed magnetic domain is formed in the magnetic thin film magnetized in one direction, the recording according to the present invention has two recording magnetization states. It is determined in a form corresponding to the switching direction of the current flowing through the winding of the external magnetic field applying means.
従って、本発明では一括消去の過程を必要とせずに、所
望の記録が実現できる。オーバーライト性能を有してい
る。再生は、従来の再生と同じ様に磁性薄膜から反射さ
れるレーザ光の偏光面回転を信号として取り出す。Therefore, according to the present invention, desired recording can be realized without the need for a batch erasing process. Has overwrite performance. In the reproduction, the polarization plane rotation of the laser beam reflected from the magnetic thin film is extracted as a signal as in the conventional reproduction.
第５図〜第７図は外部磁界印加手段の他の構成例を示す
図である。5 to 7 are diagrams showing other configuration examples of the external magnetic field applying means.
第５図ではコア部27において、巻線28が施こされた部分
の幅が永久磁石22の磁極と対向する部分より小さいこと
を特徴とする。In FIG. 5, in the core portion 27, the width of the portion to which the winding wire 28 is applied is smaller than that of the portion facing the magnetic pole of the permanent magnet 22.
第６図ではコア部29において、巻線30が施こされた部分
の厚みが、永久磁石22の磁極と対向する部分より小さい
ことを特徴とする。In FIG. 6, the core portion 29 is characterized in that the thickness of the portion provided with the winding wire 30 is smaller than that of the portion facing the magnetic pole of the permanent magnet 22.
第７図では、コア部31において、巻線32が施こされた部
分の幅及び厚み共に、永久磁石22の磁極と対向する部分
より小さいことを特徴とする。In FIG. 7, the core portion 31 is characterized in that the width and thickness of the portion where the winding 32 is applied are smaller than the portion facing the magnetic pole of the permanent magnet 22.
これらの実施例は、いずれも、第２図に示す第一の実施
例に比べて巻線部のコアの断面積を小さくすることによ
って、より低い電流値で巻線部の磁化が飽和するように
でき、その結果、印加磁場の速切り替えを容易にするも
のである。In each of these embodiments, the magnetization of the winding portion is saturated at a lower current value by reducing the cross-sectional area of the core of the winding portion as compared with the first embodiment shown in FIG. Therefore, the applied magnetic field can be easily switched at a high speed.
また第８図では、コア部37をＵ型にすることによって、
永久磁石22の磁極から生じる磁束をもう一方の磁極へ、
より効率良く導くことができ、これによって巻線36に電
流を流さない時における、上記磁束の記録媒体側へのも
れを小さくできることを特徴とする。Further, in FIG. 8, by making the core portion 37 U-shaped,
The magnetic flux generated from the magnetic pole of the permanent magnet 22 to the other magnetic pole,
It is characterized in that the magnetic flux can be guided more efficiently, and thereby leakage of the magnetic flux to the recording medium side can be reduced when no current flows through the winding.
第９図(a)，(b)では、高さ方向に着磁されたリング状の
永久磁石34と、この磁極と対向する位置にリングの内径
より同じか又は小さい穴42が形成されたコア部とから成
る。この構成では、上記穴を光の経路として用いること
ができるので、外部磁界印加手段を、光学ヘッドの真下
に設けることができることを特徴とする。9 (a) and 9 (b), a ring-shaped permanent magnet 34 magnetized in the height direction and a core 42 having a hole 42 formed at a position facing the magnetic pole, the hole 42 having the same diameter as or smaller than the inner diameter of the ring are formed. It consists of departments. In this configuration, since the hole can be used as a light path, the external magnetic field applying unit can be provided directly below the optical head.
なお、永久磁石の磁極と高透磁率磁性体との間には接着
剤などが形成される場合があり、一定の間隔が存在して
もよい。An adhesive or the like may be formed between the magnetic poles of the permanent magnet and the high-permeability magnetic body, and a certain distance may be present.
また永久磁石の磁極と対向する位置の高透磁率磁性体の
部分は前記磁極端面と同じ形状かこれより大きい形状で
あることが望ましいが、記録・消去に影響を及ぼさない
範囲で磁極端面の形状より小さくてもよい。The portion of the high-permeability magnetic material facing the magnetic pole of the permanent magnet preferably has the same shape as or a shape larger than the magnetic pole end surface, but the shape of the magnetic pole end surface does not affect the recording / erasing. May be smaller.
電流源20は電流の切換等の電流の制御機能を備えたもの
を使用することができ、あるいは電流制御手段を別に備
えてもよい。また高透磁率磁性体は永久磁石の両方の磁
極と対向する位置に形成してもよい。As the current source 20, a current source having a current control function such as switching of current can be used, or a current control means may be separately provided. Further, the high-permeability magnetic body may be formed at a position facing both magnetic poles of the permanent magnet.
（実施例） 第１図に示した光磁気記録再生消去装置を用いて、光磁
気ディスクへの情報記録・再生及び重ね書きを行った。
外部磁界印加手段としては、第７図に示したものを用い
た。第７図において、永久磁石22としては幅40mm長さ40
mm厚さ５mmのアルニコ磁石を用いた。コア部31はMn−Zn
ソフトフェライトから成り前記永久磁石22の磁極をおお
う部分が幅45mm、厚み３mm、巻線部分が幅10mm、厚み２
mm、長さ15mmの形状を有する。永久磁石22とコア部31と
はエポキシ等の接着剤により数ミクロンの接着層を隔し
て結合されている。巻線部には径100μｍの銅線が30タ
ーン巻かれている。この様な構成の外部磁界印加手段
Ａ，Ｂを記録媒体の両側に、２mm離して配設した。光磁
気ディスクとしては、120mmφのプラスチック基板上
に、スパッタ法によりTbFe膜を1000Å厚に形成したディ
スクを用いた。(Example) Using the magneto-optical recording / reproducing / erasing apparatus shown in FIG. 1, information recording / reproducing and overwriting were performed on a magneto-optical disk.
As the external magnetic field applying means, the one shown in FIG. 7 was used. In FIG. 7, the permanent magnet 22 has a width of 40 mm and a length of 40.
An alnico magnet having a thickness of 5 mm was used. The core part 31 is Mn-Zn
The portion of the permanent magnet 22 that is made of soft ferrite and has a width of 45 mm and a thickness of 3 mm, and the winding portion has a width of 10 mm and a thickness of 2
It has a shape of mm and a length of 15 mm. The permanent magnet 22 and the core portion 31 are bonded by an adhesive such as epoxy with an adhesive layer of several microns separated. A copper wire with a diameter of 100 μm is wound around the winding part for 30 turns. The external magnetic field applying means A and B having such a configuration are arranged on both sides of the recording medium with a distance of 2 mm. As the magneto-optical disk, a disk in which a TbFe film was formed to a thickness of 1000 Å on a 120 mmφ plastic substrate by a sputtering method was used.
この光磁気ディスクに、線速９ｍ／secにて、ディスク
面上４ｍＷの一定強度レーザ光を照射しながら、外部磁
界印加手段Ａ及びＢの巻線に、交互に電流０．５Ａを流
して、0.5MHzの信号の記録を行ったところ、0.5MHzの再
生c/N 約40dBが得られた。引き続き、同一トラック上
に、上記と同一条件で１MHz の信号の重ね書きを行った
ところ、１MHzの再生c/N 約40dBが得られた。この様に
本装置を用いて、オーバライトが可能であることを確認
した。While irradiating the magneto-optical disk with a constant intensity laser beam of 4 mW on the disk surface at a linear velocity of 9 m / sec, a current of 0.5 A was alternately applied to the windings of the external magnetic field applying means A and B, When a 0.5MHz signal was recorded, a reproduction c / N of 0.5MHz was obtained at about 40dB. Subsequently, when a 1 MHz signal was overwritten on the same track under the same conditions as above, a reproduction c / N of about 40 dB at 1 MHz was obtained. In this way, it was confirmed that overwriting is possible using this device.
（発明の効果） 以上述べた様に、本発明によれば、従来に比べ高速の外
部印加磁界の切替ができるので、高速でのオーバライト
性能を有する光磁気記録再生消去方法及びその装置を提
供することができる。(Effects of the Invention) As described above, according to the present invention, since it is possible to switch the externally applied magnetic field at a higher speed than in the prior art, a magneto-optical recording / reproducing / erasing method and an apparatus thereof having high-speed overwrite performance are provided. can do.
第１図は、本発明の適用された光磁気記録再生消去装置
の構成図、第２〜９図は本発明の外部磁界印加手段の実
施例を示す図、第３図(a)，(b)，(c)は、外部磁界印加
手段の動作説明図、第４図(a)〜(d)は本発明に係る光磁
気記録再生消去方式の動作モード図である。 図において、 １……光磁気ディスク、２……磁性薄膜、３……光磁気
記録用ヘッド、４，５，26，33，34，35，38……外部磁
界印加手段、６……レーザ光源、７，８，９……ビーム
スプリッタ、10……レーザビーム集光用レンズ、11……
アクチュエータ、12，13……エラ検出用受光素子、14，
15……サーボ制御回路、16……偏光フィルタ、17……再
生信号検出用受光素子、18……増幅回路、19……レーザ
光源変調用回路、20……電流源、21……記録媒体走向方
向、22，39……永久磁石、23，27，29，31，37，40……
高透磁率磁性体から成るコア、24，28，30，32，36，41
……巻線、42……穴。FIG. 1 is a block diagram of a magneto-optical recording / reproducing / erasing apparatus to which the present invention is applied, FIGS. 2 to 9 are views showing an embodiment of an external magnetic field applying means of the present invention, and FIGS. 3 (a) and 3 (b). ) And (c) are explanatory diagrams of the operation of the external magnetic field applying means, and FIGS. 4 (a) to 4 (d) are operation mode diagrams of the magneto-optical recording / reproducing / erasing method according to the present invention. In the figure, 1 ... Magneto-optical disk, 2 ... Magnetic thin film, 3 ... Magneto-optical recording head, 4, 5, 26, 33, 34, 35, 38 ... External magnetic field applying means, 6 ... Laser light source , 7, 8, 9 ... Beam splitter, 10 ... Lens for condensing laser beam, 11 ...
Actuator, 12, 13 ... Photodetector for error detection, 14,
15 ... Servo control circuit, 16 ... Polarization filter, 17 ... Reproduction signal detection light receiving element, 18 ... Amplification circuit, 19 ... Laser light source modulation circuit, 20 ... Current source, 21 ... Recording medium running Direction, 22, 39 ... Permanent magnet, 23, 27, 29, 31, 37, 40 ...
Core made of high permeability magnetic material, 24, 28, 30, 32, 36, 41
...... Winding, 42 ...... hole.
Claims (2)
体とし、レーザ光及び外部印加磁界によって情報の記録
・再生・消去を行う光磁気記録再生消去方法において、
永久磁石と、前記永久磁石の一方の磁極に接触して前記
永久磁石に直角に対向するように構成した部分と前記永
久磁石に直角に対向するように構成した前記部分に一端
を接触し他端を前記永久磁石の他方の磁極に接近するよ
うに前記永久磁石に平行に対向するように構成した部分
とを有する高透磁率磁性体からなるコア部と、前記永久
磁石に平行に対向するように構成した前記部分に巻き線
を設け、前記巻き線に電流が流れているときに前記記録
媒体に磁界を印加し、前記巻き線に電流が流れていない
ときに前記記録媒体に磁界を印加しないようにした前記
磁界印加装置を、前記記録媒体の上下両側に前記永久磁
石の同一磁極を互いに対向するように所定の間隔を置い
て固定して設置し、前記記録媒体に所定のレーザ光を照
射しながら、記録時に、一方の前記磁界印加装置の巻き
線に電流を流し、前記記録媒体に一方向の磁界を印加
し、消去時に、他方の前記磁界印加装置の巻き線に電流
を流し、記録時とは異なる方向の磁界を印加するように
したことを特徴とする光磁気記録再生消去方法。1. A magneto-optical recording / reproducing / erasing method in which a magnetic thin film having perpendicular magnetic anisotropy is used as a recording medium to record / reproduce / erase information by a laser beam and an externally applied magnetic field.
One end of the permanent magnet is in contact with one of the magnetic poles of the permanent magnet and is opposed to the permanent magnet at a right angle, and the other end is in contact with the permanent magnet at a right angle. A core portion made of a high-permeability magnetic body having a portion configured to face the permanent magnet in parallel so as to approach the other magnetic pole of the permanent magnet, and a core portion configured to face the permanent magnet in parallel. A winding is provided in the configured portion, a magnetic field is applied to the recording medium when a current is flowing through the winding, and a magnetic field is not applied to the recording medium when no current is flowing through the winding. The magnetic field applying device described above is fixedly installed on both upper and lower sides of the recording medium so that the same magnetic poles of the permanent magnets are opposed to each other at a predetermined interval, and the recording medium is irradiated with a predetermined laser beam. While recording , A current is applied to the winding of one of the magnetic field applying devices to apply a magnetic field in one direction to the recording medium, and a current is applied to the winding of the other magnetic field applying device during erasing, which is different from that during recording. A magneto-optical recording / reproducing / erasing method characterized by applying a magnetic field in a direction.
を備えた光磁気記録再生消去装置において、磁界印加手
段は、永久磁石と、前記永久磁石の一方の磁極に接触し
て前記永久磁石に直角に対向するように構成した部分と
前記永久磁石に直角に対向するように構成した前記部分
に一端を接触し他端を前記永久磁石の他方の磁極に接近
するように前記永久磁石に平行に対向するように構成し
た部分とを有する高透磁率磁性体からなるコア部と、前
記永久磁石に平行に対向するように構成した前記部分に
巻き線を設け、前記巻き線に電流が流れているときに前
記記録媒体に磁界を印加し、前記巻き線に電流が流れて
いないときに前記記録媒体に磁界を印加しないようにし
てなり、該磁界印加手段は記録媒体を介してその上下両
側に前記永久磁石の同一磁極を互いに対向するように設
置され、さらに前記両側の巻き線には記録時と消去時と
で交互にどちらかの巻き線に電流を印加する電流源が接
続していることを特徴とする光磁気記録再生消去装置。2. A magneto-optical recording / reproducing / erasing apparatus comprising an optical head and a magnetic field applying means for a recording medium, wherein the magnetic field applying means is in contact with the permanent magnet and one of the magnetic poles of the permanent magnet. One end of the permanent magnet is contacted with the portion configured to face the magnet at a right angle and the other portion of the permanent magnet is configured to face the permanent magnet at a right angle. A winding is provided in a core portion made of a high-permeability magnetic material having portions configured to face each other in parallel, and a winding provided in the portion configured to face the permanent magnet in parallel, and a current flows through the winding. The magnetic field is applied to the recording medium while the recording medium is not being applied, and the magnetic field is not applied to the recording medium when no current is flowing through the winding. To the permanent magnet It is characterized in that the same magnetic poles are installed so as to face each other, and that the windings on both sides are connected to a current source that alternately applies a current to either winding during recording or erasing. Magneto-optical recording / reproducing device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60031958A JPH0630183B2 (en) | 1985-02-20 | 1985-02-20 | Magneto-optical recording / reproducing method and device |
| US06/831,198 US4825428A (en) | 1985-02-20 | 1986-02-20 | Optomagnetic recording, reading and erasing method and implementing apparatus which permits overwriting of previously recorded information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60031958A JPH0630183B2 (en) | 1985-02-20 | 1985-02-20 | Magneto-optical recording / reproducing method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61192048A JPS61192048A (en) | 1986-08-26 |
| JPH0630183B2 true JPH0630183B2 (en) | 1994-04-20 |
Family
ID=12345465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60031958A Expired - Lifetime JPH0630183B2 (en) | 1985-02-20 | 1985-02-20 | Magneto-optical recording / reproducing method and device |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4825428A (en) |
| JP (1) | JPH0630183B2 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61269202A (en) * | 1985-05-24 | 1986-11-28 | Canon Inc | Photomagnetic recording/reproducing device |
| JPS63131355A (en) * | 1986-11-20 | 1988-06-03 | Ricoh Co Ltd | Overwrite recorder in magneto-optical recorder |
| JP2576105B2 (en) * | 1987-01-08 | 1997-01-29 | 富士通株式会社 | Magneto-optical recording device |
| JP2573601B2 (en) * | 1987-04-10 | 1997-01-22 | 日本電信電話株式会社 | Information recording method for magneto-optical medium |
| US5187694A (en) * | 1987-08-21 | 1993-02-16 | Kabushiki Kaisha Toshiba | Magneto-optical recording medium comprising recording layer and thermal bias layer, and method for recording, erasing and overwriting on the medium |
| US5146447A (en) * | 1987-09-28 | 1992-09-08 | Kabushiki Kaisha Toshiba | Optical/optomagnetic disk apparatus |
| US5202789A (en) * | 1987-10-16 | 1993-04-13 | Kabushiki Kaisha Toshiba | Optical system for preserving a state of polarization of light beam |
| US4965784A (en) * | 1988-05-31 | 1990-10-23 | Sandia Corporation | Method and apparatus for bistable optical information storage for erasable optical disks |
| JPH0250302A (en) * | 1988-08-12 | 1990-02-20 | Olympus Optical Co Ltd | Magneto-optical recorder |
| US5172364A (en) * | 1989-08-01 | 1992-12-15 | Mitsubishi Denki Kabushiki Kaisha | Magneto-optic recording apparatus with controlled magnetic field generation |
| JPH03250402A (en) * | 1990-02-28 | 1991-11-08 | Canon Inc | Magnetic recording device and system |
| US5245598A (en) * | 1990-06-27 | 1993-09-14 | Burroughs Alan C | Method and apparatus for seek operations in an optical recording system including holding a focus error signal at track crossings |
| JP2916071B2 (en) * | 1993-11-05 | 1999-07-05 | シャープ株式会社 | Magneto-optical recording device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1828190A (en) * | 1930-06-18 | 1931-10-20 | Arthur Gardner | Method of preparing a magnetizable body to receive and reproduce wave frequencies |
| US3624623A (en) * | 1969-05-05 | 1971-11-30 | Du Pont | Thermoremanent magnetic memory system |
| JPS5727452A (en) * | 1980-07-23 | 1982-02-13 | Sharp Corp | Magnetic recorder and reproducer |
| US4558440A (en) * | 1982-08-19 | 1985-12-10 | Canon Kabushiki Kaisha | System for recording patterns of magnetically recorded information by utilizing the magneto-optic effect |
| JPS59119507A (en) * | 1982-12-27 | 1984-07-10 | Fujitsu Ltd | Photo-magnetic recorder |
| WO1984004198A1 (en) * | 1983-04-15 | 1984-10-25 | Mitsubishi Mining & Cement Co | Electromagnetic actuator apparatus |
| US4610009A (en) * | 1983-05-23 | 1986-09-02 | Xerox Corporation | Writing, erasing and readout system for a magneto-optic recording medium |
| JPS6027112A (en) * | 1983-07-22 | 1985-02-12 | 松下電器産業株式会社 | electric double layer capacitor |
| JPS60147950A (en) * | 1984-01-13 | 1985-08-05 | Canon Inc | Information file which permits simultaneous erasing and recording |
| JPS60151811A (en) * | 1984-01-20 | 1985-08-09 | Olympus Optical Co Ltd | Vertical magnetized magnetic head |
-
1985
- 1985-02-20 JP JP60031958A patent/JPH0630183B2/en not_active Expired - Lifetime
-
1986
- 1986-02-20 US US06/831,198 patent/US4825428A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4825428A (en) | 1989-04-25 |
| JPS61192048A (en) | 1986-08-26 |
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